Stop one provider's trouble becoming every provider's - #79
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The chunking code in C has always sized chunks with a four-characters-per-token estimate that rounds up, whilst the three plpgsql paths that actually write the token_count column open-coded the same estimate as length(chunk_text) / 4, which truncates. The two therefore disagreed by a token on most chunks, and on anything shorter than four characters the plpgsql paths stored a zero that the BM25 scoring path in worker.c then had to clamp back up to one. Since token_count feeds the BM25 document-length normalisation, by way of AVG(token_count) in bm25.c and the per-chunk value in worker.c, hybrid search scored chunks written by the trigger slightly differently from chunks written by the C chunker. Expose the existing C counter as pgedge_vectorizer.count_tokens(text) and call it from enable_vectorization(), vectorization_trigger() and recreate_chunks(), so that there is one definition of the rule rather than two. It is declared STABLE rather than IMMUTABLE deliberately: the estimate is defined in terms of pgedge_vectorizer.model, which does not matter whilst the counter ignores the model, but would quietly invalidate an expression index or a cached plan the moment it stops doing so. Existing chunk tables are left alone. The stored values are an approximation either way, and rewriting every chunk table to correct a single token is not a trade worth making on upgrade. This is the first change for 1.2, so the extension version moves on and sql/pgedge_vectorizer--1.1--1.2.sql carries the upgrade; the 1.1 scripts are untouched.
The four provider implementations read pgedge_vectorizer.model straight from the GUC, and the provider interface had nowhere to put a model, so nothing could ask for an embedding from anything other than whatever the database was globally configured to use. That is the obstacle to a per-vectorizer model, and it is removed here rather than worked around by setting the GUC around each request: a provider that silently depends on ambient global state cannot be asked to embed with anything else, and mutating that state inside the worker's batch loop would have made the error paths considerably harder to reason about. generate() and generate_batch() therefore take the model explicitly, and the providers use the argument. Every existing call site passes the GUC, so behaviour is unchanged. generate_embedding() and detect_embedding_dimension() gain optional provider and model arguments on the same rule that will apply to the registry: NULL means fall back to the GUC. Neither is STRICT any more, since a STRICT function would return NULL before that argument could reach the C. The dimension probe needs this in particular, because a vectorizer created with an override needs the dimension of the model it names, not of whatever the GUCs happen to say.
pgedge_vectorizer.vectorizers gains nullable provider and model columns, and enable_vectorization() gains matching parameters in ninth and tenth position so that existing positional calls are untouched. NULL means inherit the GUC at the time the work runs rather than a copy taken at creation, so an installation that never sets either behaves exactly as it did. Where the dimension is not given, the probe now asks about the model this vectorizer will actually use rather than the one the GUCs name, which would otherwise size the vector column against the wrong model whenever an override was passed. Nothing reads the columns yet; the worker does that in the next commit.
The model was one GUC applied to every table in the database, which is the wrong granularity: a table of short product titles and a table of long technical documents are rarely well served by the same model, and there was no way to embed one table locally through Ollama whilst another went to a hosted provider. A vectorizer now records its own provider and model, both nullable, NULL meaning inherit. Inheritance resolves when the work runs rather than being copied at creation, so an installation that sets neither carries on exactly as before. They can be pinned at enable_vectorization() or changed afterwards with the new set_embedding_model(). The worker resolves inheritance in the query that fetches a batch, with a left join against the registry and COALESCE against the GUCs, so the rule lives in one place and an item whose vectorizer has since been disabled falls back through the same expression rather than needing a special case. A batch is selected by age across every vectorizer at once, so it can hold items for several models, and a request carries one; the batch is therefore grouped by (provider, model) before the existing loop runs and batch_extent() breaks on the same key. Sorting rather than merely breaking the run matters, because two tables' items alternating in time would otherwise give requests of one item each. The provider is resolved per request instead of once per batch. set_embedding_model() refuses to change a vectorizer that already has embeddings unless force_reembed is passed. The refusal keys on the model changing rather than the dimension changing, which is the case worth guarding: a dimension change is caught before any write by the existing check in the worker, whilst a change between two models of the same width, say text-embedding-3-small and text-embedding-ada-002 at 1536 each, would leave the old vectors in place, correctly shaped and meaningless beside the new ones, with nothing reporting a problem. With force_reembed the embeddings are cleared, the column rewidened if needed, the queue cleared and every chunk requeued, all in one transaction. Chunk rows, token counts, sparse embeddings and the BM25 statistics are untouched, since none of them depends on the embedding model. Three things fell out along the way. generate_embedding() and detect_embedding_dimension() take an optional provider and model, and can no longer be STRICT, because NULL has to reach the function to mean "use the GUC". That makes generate_embedding(NULL) raise rather than return NULL, which is what the function always meant to do and said so in its own code, unreachably. The array of chunk tables that disable_vectorization() drops was collected with no ORDER BY, so the notices came out in whatever order the scan returned, and adding registry columns changed it. It is ordered now. Adding defaulted parameters to enable_vectorization() with CREATE OR REPLACE defined a second function rather than replacing the old one, leaving two overloads on any upgraded installation, an eight-argument call reaching a body that knew nothing of the new columns, and COMMENT ON FUNCTION failing as ambiguous, whilst a fresh install was perfect throughout. pg_regress installs whatever default_version says, so it can never see this; 012_upgrade_1_1_to_1_2 builds a 1.1 installation, upgrades it, and compares its functions, columns and views against a fresh 1.2, which is the shape of check that catches the whole class rather than this one instance. Closes #27
test/expected/ carries numbered variants of embedding.out for the cases where provider API keys are actually available, and pg_regress passes if the output matches any of them. Only the default one was updated for the new generate_embedding() signature and for NULL input now raising, so every platform without keys was happy and the macOS runner, which has them, failed against embedding_4.out. The two changed lines are common to all five, so all five now carry them.
Widening where the model comes from, from one GUC to a registry column and a SQL argument, broke assumptions in several places that were safe whilst it was a single trusted setting. The model was interpolated raw into every provider's request body, and into Gemini's URL path. Escaped now in all four, once in the shared OpenAI-format builder that OpenAI and Voyage use and once each in Ollama and Gemini, with a percent-encoding helper for the URL segment, where a '/' or '?' would have sent the request to a different endpoint. A rate limit deferred every remaining item in the pull and charged each one a deferral, which was right whilst a pull could only carry one provider's work. Now that a batch can span providers, that spent deferrals belonging to a provider that had not refused anything and, once they ran out, failed its items outright. Only the refused provider's items are deferred; the rest go back to pending uncharged for the next pull. set_embedding_model() computed the new dimension and altered the column only when the vectorizer had chunks, so an empty one kept the width it was created with and failed every embedding written after the change, which is precisely the failure the function exists to prevent. The dimension is resolved and the column altered whichever it is, whilst clearing embeddings and requeuing stay conditional. That does mean a call without an explicit dimension always probes the provider, as enable_vectorization() does, which the reference now states. The requeue omitted max_attempts, taking the column default of 3 rather than pgedge_vectorizer.max_retries as every other queue insert does. The worker's inheritance expression handled NULL but not an empty string, which resolve_provider() and resolve_model() in embed.c both treat as inherit; NULLIF puts them on the same footing. Two documentation corrections. The data-management guidance still told users to drop the chunk table and enable vectorization again after a dimension change, which throws away chunks, sparse embeddings and BM25 statistics that were never wrong. And the configuration example passed NULL as the model without saying that the provider defaults to NULL too, so it reverts alongside unless named again. Raised by CodeRabbit on #74.
The call restoring ptm_named's model left provider at NULL, so the reset case that follows started from a vectorizer with nothing pinned and could not show that the provider clears alongside the model. Pinning both first makes the assertion mean something. The provider named matches the GUC, so the effective values still do not move and the case remains the no-op it is there to cover. Raised by CodeRabbit on #74.
A vectorizer whose provider and model are NULL inherits the GUCs, and inheritance resolves when the work runs rather than being copied at creation. Changing pgedge_vectorizer.model therefore re-points every inheriting vectorizer at once, leaving a chunk table holding vectors from the old model beside new ones from the new. Similarity between two models' vectors is noise, so those rows become effectively invisible to search rather than merely stale, and where the widths match, as they do between text-embedding-3-small and text-embedding-ada-002, the dimension check in the worker cannot see it either. set_embedding_model() guards the per-vectorizer path and cannot guard this one: the extension does not own that setting and cannot intercept every way it changes. Rather than pretending otherwise, each chunk now records the provider and model that produced its vector, written by update_embedding() in the same statement as the embedding so the two cannot disagree, and embedding_model_status() reports where that differs from what the vectorizer would use now. That diagnoses instead of preventing, but it catches drift whatever its cause, including a setting changed months ago. Reporting alone would leave a number and nothing to do about it, and the obvious remedy does not work: set_embedding_model(force_reembed => true) takes its no-op branch here, because an inheriting vectorizer's effective model already is the new one. reembed() therefore clears and requeues every chunk not known to have come from the effective provider and model. Rows with nothing recorded are counted apart in the report, since they predate the columns and may well be current, but reembed() treats them as needing redoing, a row that cannot be shown to be current being one to do again; on a freshly upgraded installation that is every row, which the documentation says plainly. A change of embedding width takes every chunk with it, drifted or not, because a column cannot hold two widths. Two things found on the way. The columns had to be added to chunk tables by the upgrade script itself. enable_vectorization() adds them to a chunk table it finds without them, but nothing re-runs it on upgrade, and the worker writes both columns in the same statement as the embedding, so an existing installation would have failed every embedding write until someone happened to re-enable a vectorizer. 012 now compares an upgraded chunk table's columns against a freshly created one, which is the check that would have caught it. update_embedding() interpolated the chunk table's name into its UPDATE without quoting, so it would have failed for a schema-qualified source, where the generated name is one identifier with a dot in it rather than a qualified reference. Fixed in passing, since it is the statement being changed. Closes #75
hybrid_search() embedded the query with the GUCs, which was right whilst that was the only place a model could come from. Since a vectorizer can pin its own, a query embedded by one model was being compared against chunks embedded by another: meaningless distances where the widths match, and an outright error where they do not, which is the failure this whole line of work exists to prevent, arriving through the search path instead. It now looks the provider and model up alongside the chunk table and passes them through, NULL and all, so a vectorizer that has pinned nothing behaves as before. The 1.1 script never redefined the function, so the upgrade carries a full replacement. The worker's join to the registry could match a queue row twice, because only (source_table, source_column) is unique and two vectorizers can be pointed at one chunk table with an explicit chunk_table_name. The item would then be embedded twice and counted twice into the BM25 corpus statistics. A LATERAL with LIMIT 1 makes the join return one row whatever the registry holds; a unique constraint on chunk_table would be the stronger fix but needs a story for installations that already have duplicates, which is separate work. set_embedding_model() compared raw stored values where the worker, embedding_model_status() and reembed() all treat an empty string as inherit, so an empty override would have been seen as a change by one of the four and not by the other three, and would have reached the dimension probe as a model name of ''. NULLIF everywhere, and the probe now asks about the effective values. resolve_model() returned an unset model GUC unvalidated, where resolve_provider() already refuses one. The providers interpolate it straight into their request bodies, so an empty setting put "model":"" on the wire and a NULL one would have been dereferenced whilst escaping it. One finding declined. CodeRabbit proposed charging a provider that cannot be resolved to the items of its request, so that the rest of the pull proceeds. The observation behind it is right, and is now issue #78: since a vectorizer can name its own provider, one bad name stops every other vectorizer in the database. The prescription is not, because 005_batch_failure_backoff.pl exists to prevent exactly that and injects exactly this fault: charging a blameless item for a misconfigured provider works through the queue retiring one innocent row per max_attempts cycles, so a single mistyped provider name would mark the whole queue failed. Fixing it properly means skipping the group without charging it whilst still reaching the batch backoff, which needs a way to report a batch-level fault without an exception. That is more than this change should carry. Raised by CodeRabbit on #77.
process_queue_batch() still assumed a pull of queue items belonged to a single provider, which stopped being true when a vectorizer could name its own. Two failures followed from that one assumption, and they share enough machinery to be worth fixing together. A rate limit stopped everything. The cooldown was a single deadline checked before the pull, so a hosted provider on a free tier held up a local model with no quota at all, and the 429 handler broke out of the request loop so nothing else in that pull was attempted either. Cooldowns are now kept per provider and the claim excludes the ones cooling, which has to happen in SQL rather than after the fetch: the pull takes the oldest batch_size rows, so a cooling provider with a backlog at the head of the queue would otherwise fill every batch and starve everyone behind it, which is the same fault one step further along. Because the batch is sorted by (provider, model) a provider's items are contiguous, so the 429 handler steps over exactly the run it deferred and lets the rest of the pull proceed. An unresolvable provider stopped everything too. Resolution raised, which aborted the transaction and returned the whole pull to pending including work whose provider was fine, and the next pull failed in the same place. The group is now put back and skipped, uncharged, and the loop carries on. That removes the exception the batch backoff depended on, so process_queue_batch() reports whether it attempted anything and the caller grows the wait when a pull found work and could attempt none of it. Without that a database whose only provider is mistyped would poll flat out, which is precisely what 005_batch_failure_backoff.pl exists to prevent. 005 needed two of its nine assertions rewritten, and this is worth being plain about. Five passed untouched because the backoff wording is unchanged, and the two that failed were both counting "error in processing, continuing", which is the exception handler's line: they asserted the mechanism rather than the behaviour, and the mechanism is what the issue asked to change. They now count the new line, the file's header no longer claims the fault raises, and a ninth assertion was added for the property the test only implied, that no item is ever charged for a provider being misconfigured. That property is the constraint this whole design was built around, so it is now checked rather than assumed. One thing found by the new tests rather than reported. set_embedding_model() counted rows where it meant embedded rows, so a vectorizer whose provider was mistyped, and which had therefore never embedded anything, could not be corrected: the function refused, claiming its chunks were "embedded with" a model that had never run. The refusal exists because vectors from two models are not comparable, and a chunk with no vector has nothing to be incomparable with. Closes #76
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| Category | Results |
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| Compatibility | 2 high (1 false positive) |
| Complexity | 5 medium |
🟢 Metrics 44 complexity · 0 duplication
Metric Results Complexity 44 Duplication 0
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Included review availability: 3 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. 📝 WalkthroughWalkthroughThe extension advances from version 1.1 to 1.2. It adds per-vectorizer provider and model settings, embedding provenance, token counting, model-status and re-embedding APIs, and provider-aware hybrid search. Workers now group queue items by provider and model, isolate cooldowns, and leave unavailable-provider items pending without charging attempts. Documentation and regression tests cover upgrades, model drift, token counts, model changes, and provider isolation. Fixed issue severity: Medium Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to Queue processing now isolates provider failures and cooldowns so healthy providers can continue processing while unavailable-provider work remains pending and uncharged. No concrete current-head merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Out of Scope Changes checkExplanation The diff includes substantial unrelated or prerequisite work, including the full 1.2 SQL implementation, provider/model APIs, token counting, upgrade scripts, extensive documentation, and model-management tests. These changes exceed the provider-isolation objectives in issue [ Resolution Rebase onto the intended prerequisite changes or split the cumulative work into separate pull requests. Keep this pull request limited to worker provider isolation, the set_embedding_model correction, and their required tests. If the stacked diff must remain, document the dependency and confirm that the extra changes are not being reviewed or merged as part of this issue.
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In `@docs/api_reference.md`:
- Around line 217-224: Update the embedding_model_status() signature in the API
reference to use the declared parameter names p_source_table and p_source_column
instead of source_table and source_column, while preserving their REGCLASS/NAME
types and NULL defaults.
In `@docs/configuration.md`:
- Around line 82-89: In the documentation around set_embedding_model(), remove
the duplicated broader statement that implies force_reembed => true is always
required when embeddings exist. Keep the qualified rule: require force_reembed
=> true only when the vectorizer already has embeddings and the effective model
changes.
In `@docs/troubleshooting.md`:
- Around line 136-138: Update the diagnostic query to report each vectorizer’s
effective provider, including the database-wide pgedge_vectorizer.provider
fallback when the row-level provider is NULL, and remove the provider IS NOT
NULL filter so inherited values are visible.
In `@src/worker.c`:
- Around line 2040-2045: Set attempted to true in the batch_sparse_only branch
after the sparse-only request successfully allocates embeddings, updates chunk
rows, and marks items completed, matching the provider path so
process_queue_batch() reports successful work for pulls containing only
sparse-only items.
- Around line 1749-1755: Move the cooling-filter construction using cooling,
provider_cooling_names(), and psprintf() to after StartTransactionCommand() and
SPI_connect() within process_queue_batch(), ensuring these allocations use the
transaction’s SPI context while preserving the existing filter behavior.
In `@test/t/011_per_table_model.pl`:
- Around line 46-53: Register the forked fake-provider child for cleanup in an
END block after the server_pid is created, ensuring the child is terminated and
reaped if the parent exits before explicit cleanup. Use the existing server_pid
and cleanup mechanisms, while preserving the child’s fake_provider execution and
normal explicit cleanup path.
In `@test/t/013_embedding_model_recorded.pl`:
- Around line 42-49: Add exit-time cleanup for both fake-provider child
processes created in the fork blocks of 013_embedding_model_recorded.pl by
registering an END handler after each fork that terminates the corresponding
child when its PID is defined. Follow the existing cleanup pattern from
015_provider_unavailable_isolation.pl without changing the normal child or
parent execution flow.
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Two of these are mine and would have bitten. A pull made entirely of sparse-only items reported that it attempted nothing, because `attempted` was set only on the path that reaches a provider, and the sparse-only branch needs none. The caller would then have grown the backoff to its five minute cap and logged that there was no usable provider, whilst every item in the pull was in fact scored and completed. That branch exists for chunks that already have their dense embedding, so it is not an unusual path. The cooling-provider filter was built before the transaction started, in a context the worker keeps for the life of the process, so every poll left a little behind for ever. Moved inside, where the transaction reclaims it. The rest are documentation and test hygiene. The reference gave embedding_model_status() parameter names that do not exist, so a named-argument call copied from the page would have failed; they carry a p_ prefix because the function returns columns of the same names. The configuration page stated the force_reembed rule twice, the second time without the qualifier that makes it true, so it read as an unconditional refusal whenever embeddings exist. And the troubleshooting query filtered on provider IS NOT NULL, which returns nothing in precisely the case that section is about: a mistyped pgedge_vectorizer.provider leaves every override NULL. It shows the effective provider now. 011, 013 and 014 gained the END block that 015 already had, after a failing assertion in 015 left its fake provider holding the pipe and hung prove rather than reporting the failure. Raised by CodeRabbit on #79.
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Summary
process_queue_batch()still assumed a pull of queue items belonged to a single provider, which stopped being true once a vectorizer could name its own (#74). Two failures follow from that one assumption, and they share enough machinery to be worth fixing together rather than twice.A rate limit stopped everything. The cooldown was a single deadline checked before the pull, so a hosted provider on a free tier held up a local model with no quota at all, and the 429 handler
breaks out of the request loop so nothing else in that pull was attempted either.batch_sizerows, so a cooling provider with a backlog at the head of the queue would otherwise fill every batch and starve everyone behind it — the same fault, one step further along.An unresolvable provider stopped everything. Resolution raised, which aborted the transaction and returned the whole pull to
pendingincluding work whose provider was fine; the next pull failed in the same place, so nothing drained and nothing failed. The group is now put back and skipped, uncharged, and the loop carries on.That removes the exception the batch backoff depended on, so
process_queue_batch()returns whether it attempted anything and the caller grows the wait when a pull found work and could attempt none of it. Without that, a database whose only provider is mistyped would poll flat out.About the change to 005_batch_failure_backoff.pl
Worth reading rather than skimming, since that test is the constraint this design was built around.
Five of its assertions passed untouched, because the backoff wording is unchanged. The two that failed were both counting
"error in processing, continuing"— the exception handler's line. They asserted the mechanism, and the mechanism is exactly what the issue asked to change: the whole point is that this fault stops raising. They now count the new line, and the file's header no longer claims the fault raises.I also added a ninth assertion for the property the test only implied in a comment: that no item is ever charged for a provider being misconfigured. That is the thing that must not regress, so it is now checked rather than assumed.
I did try CodeRabbit's earlier suggestion of charging those items (on #77); it failed 7 of 005's 8 assertions, which is why this takes the longer route instead.
Found rather than reported
set_embedding_model()counted rows where it meant embedded rows, so a vectorizer whose provider was mistyped — and which had therefore never embedded anything — could not be corrected: the function refused, claiming its chunks were "embedded with" a model that had never run. The refusal exists because vectors from two models are not comparable, and a chunk with no vector has nothing to be incomparable with. The new test in 015 is what walked into it.Test plan
014_provider_rate_limit_isolation.pl: two vectorizers on different providers sharing one fake socket that refuses one model with a 300 secondRetry-After. The healthy one must drain within half a 20 second poll interval, so a pass means the same pull that met the 429 carried on to it. Verified to fail with thebreakrestored, and verified that an earlier version of this test passed with it, which is why the poll interval and the ordering are the way they are.015_provider_unavailable_isolation.pl: one vectorizer naming a provider that does not exist, one healthy. Same-pull assertion, plus that the bad one's items staypendingwithattemptsat zero, that the log names the provider and the table, and that correcting the provider is on its own enough to drain the queue.005_batch_failure_backoff.plpassing, 9 assertions, including the new one.Note on the base branch
Stacked on #77, because both it and #74 rewrote large parts of
src/worker.c. The diff carries those and #72's until they land. It targetsmainbecause CI only runs on PRs based onmain,masterordevelop.Closes #76